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DEMO MANUAL SCP-LT3463-EVALZ
Rev. 0
1
DESCRIPTION
Demonstration circuit SCP-LT3463-EVALZ is a dual output DC-DC converter designed to create a dual polarity regu-lated voltage for powering several signal chains. The pos-itive regulator is a boost converter (with 20V output) while the other is an inverting charge pump (with –20V output).
Like all boards in the Signal Chain Power series, this board is designed to be easily plugged into other SCP boards to form a complete signal chain power system, enabling fast evaluation of low power signal chains. To evaluate this board, some universal SCP hardware is required, namely:
SCP-INPUT-EVALZ SCP-FILTER-EVALZ SCP-OUTPUT-EVALZ SCP-1X2BKOUT-EVALZ SCP-1X5BKOUT-EVALZ SCP-5X1-EVALZ SCP-THRUBRD-EVALZ
To properly evaluate SCP series demo boards, you will need the SCP Configurator companion software. SCP Configurator can help you choose the right board and to-pology for your design.
Note that this Demo Manual does not cover details im-portant to the operation and configuration regarding the LT3463. Please refer to the LT3463 datasheet for a com-plete description of the part.
Design files for this circuit board are available. All registered trademarks and trademarks are property of their respective owners.
Table 1. Performance Summary.
SYMBOL PARAMETER NOTES MIN TYP MAX UNITS
VIN(MAX) Max Input Voltage 15 V
VOUT(MAX) Max Output Voltage Positive VOUT
Negative VOUT
+40
–40
V
V
ISW(LIM) Switch Current Limit 180 250 320 mA
BOARD IMAGE
Figure 1. SCP-LT3463-EVALZ Board
DEMO MANUAL SCP-LT3463-EVALZ
Signal Chain Power LT3463 Dual Output Converter
DEMO MANUAL SCP-LT3463-EVALZ
Rev. 0
2
QUICK START PROCEDURE
Demonstration circuit SCP-LT3463-EVALZ is easy to set up to evaluate the performance of any SCP hardware configuration.
1. The SCP-LT3463-EVALZ ships with default output volt-ages of 20V and –20V, respectively. To change the out-put voltage, see “Configuration Settings” section, and modify the board accordingly. Be sure to check for open connections or solder shorts after making any modifi-cations.
2. Connect the SCP-INPUT-EVALZ and SCP-OUTPUT-EVALZ boards to the SCP-LT3463-EVALZ (refer to Fig-ure 2) and connect the input board to a voltage source, VSOURCE. Connect the output board to a voltmeter or dynamic load. Slowly raise the input voltage until the SCP-LT3463-EVALZ powers up into regulation and sweep VSOURCE through the desired range of operation.
NOTE: Make sure that the input voltage is always within spec. If using a dynamic load to measure output volt-age, make sure the load is initially set to zero.
3. Check for proper output voltages. The output should be regulated at the programmed value (±5%).
4. Once the proper output voltage is established, power off VSOURCE and similarly test other boards in the SCP system until all elements have been individually verified prior to assembling into the final circuit configuration.
NOTE: When measuring the input or output voltage rip-ple, use the optional SMA connector locations available on the input, output, 1 ´ 5, 1 ´ 2, and 5 ´ 1 breakout boards. Avoid using the test point connections with long scope leads.
Figure 2. Proper Measurement Equipment Setup (Use SMA connectors for Measuring Input or Output Ripple)
DEMO MANUAL SCP-LT3463-EVALZ
Rev. 0
3
CONFIGURATION SETTINGS
Demonstration circuit SCP-LT3463-EVALZ is a dual output DC-DC converter designed to create a dual polarity regu-lated voltage for powering several signal chains. The pos-itive regulator is a boost converter (with 20V output) while the other is an inverting charge pump (with –20V output).
Each output of the SCP-LT3463-EVALZ is resistor-pro-grammable from |5V| to |40V|. The board can be also con-figured to drive VIOC-capable linear regulators.
OUTPUT VOLTAGE PROGRAMMING
Table 2. Resistor Selection Guide for Common Output Voltages
|VOUT| (V) R1 (Ω) R2 (Ω) R3 (Ω) R4 (Ω)
5.0 200k 66.5k 49.9k 200k
5.5 340k 100k 76.8k 340k
6.0 523k 137k 110k 523k
6.5 261k 61.9k 49.9k 261k
7.0 1.07M 232k 191k 1.07M
7.5 590k 118k 97.6k 590k
8.0 1.0M 187k 154k 1.0M
8.5 340k 59k 49.9k 340k
9.0 806k 130k 113k 806k
9.5 1.07M 162k 140k 1.07M
10.0 931k 133k 115k 931k
11.0 1.07M 137k 121k 1.07M
12.0 1.18M 137k 124k 1.18M
13.0 1.87M 200k 178k 1.87M
14.0 1.02M 100k 90.9k 1.02M
15.0 1.0M 90.9k 82.5k 1.0M
16.0 1.18M 100k 93.1k 1.18M
17.0 1.15M 90.9k 84.5k 1.15M
18.0 2.21M 165k 154k 2.21M
19.0 1.02M 71.5k 66.5k 1.02M
20.0 1.0M 66.5k 61.9k 1.0M
24.0 1.82M 100k 95.3k 1.82M
30.0 1.21M 52.3k 49.9k 1.21M
36.0 1.43M 51.1k 49.9k 1.43M
40.0 1.69M 54.9k 49.9k 1.62M
SHDN PIN CONFIGURATION
The SHDN pins (SHDN1 and SHDN2) are tied to the op-tional SCP Run/Sequence headers P1 and P2. To create a harness for this function, use Molex part 0510650300 with crimp pin 50212-8000.
To use an active run signal, use a 100kW resistor for either pull-up or pull-down resistors R9, R10, R12 and R13, short R11 and R14 with 0W, respectively, and use the drive signal from connectors P1 and P2.
VOLTAGE INPUT-TO-OUTPUT CONTROL (VIOC) IMPLEMENTATION
To implement the VIOC function for both regulators, set R6 and R8 to 0W, respectively. Refer to the “Configuration Settings” section in the Demo Manual for the low-dropout (LDO) linear regulator board and use the following config-uration for this board.
Table 3. VIOC Cross-Reference Designators
VIOC SETTING REFERENCES RBOT RTOP RMAX
VOUT Reference Designators for VOUT1 R2 R1 R5
VOUT Reference Designators for VOUT2 R3 R4 R7
Positive VIOC Equations
ISINK is the current through RMAX which is typically 15µA. Since the divider current is fixed due to the internal low side gain setting feedback resistor and is less than the rec-ommended divider current of 100µA, the effect of the sink current on the maximum linear regulator input voltage cannot not be mitigated and should be taken into consid-eration.
+VOUT = 1 .2 5 V 1 + R1
R2
⎛⎝⎜
⎞⎠⎟
−VOUT = 1 .2 5 VR4R3
⎛⎝⎜
⎞⎠⎟
VL DOIN − VL DOOUT = VVIOC = 1 .2 5 V RBOT +RTOPRBOT
⎛⎝⎜
⎞⎠⎟
V MAX( )LDOIN = 1 .2 5 V RBOT +RTOP +RMAXRBOT
⎛⎝⎜
⎞⎠⎟+ ISINKRMAX
DEMO MANUAL SCP-LT3463-EVALZ
Rev. 0
4
Negative VIOC Equations
Because the VLDOIN term is simply the sum of the final output voltage after the LDO and the difference the LT3463 is adding on top, it can be helpful to take the desired final output voltage, add 1.0V, and then look up that voltage-resistor combination from Table 2.
RMAX can then be obtained by figuring out the difference between the maximum and nominal output voltage of the LT3463, divided by the current through the internal RBOT resistor, which is 1.25/RBOT.
VL DOIN − VL DOOUT = VVIOC = −1 .2 5 V RTOPRBOT
⎛⎝⎜
⎞⎠⎟
V MAX( )L DOIN = −1 .2 5 RTOP +RMAXRBOT
⎛⎝⎜
⎞⎠⎟+ VVIOC
RMAX4 0 k
⎛⎝⎜
⎞⎠⎟
DEMO MANUAL SCP-LT3463-EVALZ
Rev. 0
5
PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
1 1 PCB PRINTED CIRCUIT BOARD ANALOG DEVICES 08_060170a
2 1 C1 CAP 4.7uF 25V CER X5R 0805 SAMSUNG CL21A475KAQNNNG
3 2 C9, C10 CAP MLCC 0603 (Note 1) N/A
4 2 C2, C3 CAP 1uF 50V CER X7R 0805 SAMSUNG CL21B105KBFNNNE
5 1 C4 CAP 0.1uF 100V CER X7R 0603 SAMSUNG CL10B104KC8NNNC
6 3 C5, C6, C7 CAP MLCC 0805 (Note 1) N/A
7 1 C8 CAP 10pF 50V CER NP0 0805 AVX 08055A100JAT2A
8 1 D1 DIODE SCHOTTKY BARRIER RECTIFIER DIODES INC B0540W-7-F
9 1 INPUT CONN MALE 3POS 2.54MM PITCH R/A SULLINS PBC03SBAN
10 2 L1, L2 IND 10uH 0.45A 0.39-OHM MURATA LQH32CN100K53L
11 2 OUTPUT+, OUTPUT-
CONN FEMALE 3POS 2.54MM PITCH R/A SULLINS PPPC031LGBN-RC
12 2 P1, P2 CONN-PCB 3POS HEADER WIRE TO BRD WAFER ASSY STRAIGHT 2MM PITCH
MOLEX 53253-0370
13 2 R1, R4 RES 4.53M 1% THICK FILM 0805 VISHAY CRCW08054M53FKEA
14 6 R6, R8, R10, R11, R13, R14
RES THICK FILM 0805 (Note 1) N/A
15 4 R5, R7, R9, R12 RES 0-OHM 1% THICK FILM 0805 VISHAY CRCW08050000Z0EA
16 1 R2 RES 301K 1% THICK FILM 0805 PANASONIC ERA-6AEB3013V
17 1 R3 RES 280K 1% THICK FILM 0805 PANASONIC ERA-6AEB2803V
18 1 U1 IC DUAL MICROPOWER DC/DC CONVERTER WITH SCHOTTKY DIODES
ANALOG DEVICES LT3463AEDD#PBF
19 2 VIOC+, VIOC- CONN FEMALE 2POS 2.54MM PITCH R/A SULLINS PPPC021LGBN-RC
Note 1. These items are not stuffed (DNI).
DEMO MANUAL SCP-LT3463-EVALZ
Rev. 0
6
SCHEMATIC DIAGRAM
LT3463
53253
-03
70
22
<DESIGN_VIEW>
: n/aProduct(s): LT3463HW TYPE : Customer Evaluation
1:1
A02_060170
A SERQUINA
DNI
LT346
3AE
DD#
PBF
DNI
280
K
DNI
PBC0
3SB
AN
53253
-03
70 DNI
DNI
10U
H
DNI
50V
DNI
0
301
K
0
1UF
10PF
PPPC
031
LGB
N-RC
4.5
3ME
G0
10U
H
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0.1UF
100V
B0540
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PPPC0
21L
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INPUT
C1
R9
R11
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R14P2
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R7
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C6C7
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106 PAD
98
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DEMO MANUAL SCP-LT3463-EVALZ
Rev. 0
7 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
DEMO MANUAL SCP-LT3463-EVALZ
Rev. 0
8 1/21 www.analog.com
© ANALOG DEVICES INC. 2020
ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
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